Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Headed bolt or screw with threads and complementary nut
Patent
1992-12-18
1995-08-01
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Headed bolt or screw with threads and complementary nut
411414, 411432, 411436, 411908, 4052595, F16B 3500, F16B 3504, E21D 2002
Patent
active
054375266
ABSTRACT:
An anchoring arrangement for use in underground mining or foundation work or as a reinforcing element for concrete includes a rod-shaped tension member of composite fiber material which has, over at least an anchoring portion thereof, a helically extending external thread with ribs formed by impressing valleys in the tension member. An anchoring member having a corresponding internal thread can be screwed onto the tension member. For obtaining a radial pressure on the tension member as a result of a wedge effect, the angle of inclination of the sides of the thread relative to the longitudinal axis of the tension member is smaller than 45.degree.. The thread preferably is a fiat trapezoidal thread. In an anchoring member which is stiff relative to circumferential tensile forces, the flat angle of inclination of the sides of the thread increases the radial pressure acting on the tension member, which leads to an increased effect into the depth and a higher resistance to shearing. The anchoring member may have a changing circumferential tensile stiffness over the length of the threaded engagement with the tension member, so that the anchoring member can expand at the point of highest stress concentration, with the result that a change in length of the tension member may occur.
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patent: 5060740 (1991-10-01), Yousef et al.
patent: 5080547 (1992-01-01), Moghe
Bolmer Berthold
Herbst Thomas
Lugering Anton
Schnitzler Lorenz
von Grolman Hartmut
Dyckerhoff & Witmann Aktiengesellschaft
Kueffner Friedrich
Rochling Haren KG
Wilson Neill R.
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